Unexpected type mismatch error for Either and Either.Right.

VSCode Version: 1.99.3
macOS: 26.0 (25A354)
Language Support for Java(TM) by Red Hat v1.45.0
Java Version: Zulu 17.60 (but I was able to repro on multiple versions

vs code won't build the project reporting the code issue as Type mismatch for Either vs Either.Right. Either.Right is a derived class from Either.
When building with mvn compile or with other IDEs this code works just fine.

Steps to Reproduce:

1. Create a function

    public <R> Mono<Either<Throwable, ResponseEntity<List<SimpleProductTileV2>>>> noOfferProductDetails(
            BffRequestContext<R> requestContext) {
        
        // No liam return empty list of products
        return Mono.just(new Either.Right<>(new ResponseEntity<>(Collections.<SimpleProductTileV2>emptyList(), HttpStatus.OK)));
    }

2. Build
3. Get error

Type mismatch: cannot convert from Mono<Either.Right<ResponseEntity<List<SimpleProductTileV2>>>> to Mono<Either<Throwable,ResponseEntity<List<SimpleProductTileV2>>>>

mvn compile works just fine

Looks like vs code compiler incorrectly decode Either.Right or something like that.

Reproduce the reported Java snippet in VS Code using the listed Java and Language Support for Java versions, then compare the result with mvn compile and other IDEs. Done means the extension no longer reports a type mismatch between Mono<Either.Right<...>> and Mono<Either<...>> for this case.